粉末烧结钨合金材料的绝热剪切变形局域化实验研究

在分离式Ｈｏｐｋｉｎｓｏｎ压杆装置上对斜圆柱粉末烧结钨合金试件进行了冲击实验，实验中观察到试件的宏观破断现象；用光学和扫描电子显微镜观察到钨合金中出现绝热剪切带这一变形局域化现象。实验结果表明，钨颗粒的形状和空间取向对钨合金剪切变形形式有明显的影响。

ADIABATIC SHEARING LOCALIZATION OF TUNGSTEN HEAVY ALLOY

A combined compression/shear testing method was used in order to investigate the adiabatic shear localization of pre-tungsten heavy alloy. The combined simultaneous loading is applied by a split Hopkinson pressure bar (SHPB), which generates strain rate as high as 103 s-1. The cylindrical specimen has its axis inclined to the loading axis. Adiabatic shear localization has been observed in the high rate compression/shear tests; relatively narrow shear bands are formed, followed immediately by catastrophic fracture. The deformed microstructures are examined by using scanning electron dricroscopy and optical microscopy. Examination of the deformed microstructures supplies new insight into the deformation and failure mechanism of the tungsten heavy alloy.